diff: index-line: respect --abbrev in object's name
A handful of Git's commands respect `--abbrev' for customizing length of abbreviation of object names. For diff-family, Git supports 2 different options for 2 different purposes, `--full-index' for showing diff-patch object's name in full, and `--abbrev' to customize the length of object names in diff-raw and diff-tree header lines, without any options to customise the length of object names in diff-patch format. When working with diff-patch format, we only have two options, either full index, or default abbrev length. Although, that behaviour is documented, it doesn't stop users from trying to use `--abbrev' with the hope of customising diff-patch's objects' name's abbreviation. Let's allow the blob object names shown on the "index" line to be abbreviated to arbitrary length given via the "--abbrev" option. To preserve backward compatibility with old script that specify both `--full-index' and `--abbrev', always show full object id if `--full-index' is specified. Signed-off-by: Đoàn Trần Công Danh <congdanhqx@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Đoàn Trần Công Danh committed
Aug 21, 2020 at 18:51 UTC
3046c7f69a6337a971b219d047b8110e3f9ea971
6 files changed
+90
-5
Documentation/diff-options.txt
+5
-4
index 7987d72b02..de3f16b3e9 100644
--- a/Documentation/diff-options.txt
+++ b/Documentation/diff-options.txt
@@ -441,10 +441,11 @@ endif::git-format-patch[]
--abbrev[=<n>]::
Instead of showing the full 40-byte hexadecimal object
name in diff-raw format output and diff-tree header
- lines, show only a partial prefix. This is
- independent of the `--full-index` option above, which controls
- the diff-patch output format. Non default number of
- digits can be specified with `--abbrev=<n>`.
+ lines, show only a partial prefix.
+ In diff-patch output format, `--full-index` takes higher
+ precedence, i.e. if `--full-index` is specified, full blob
+ names will be shown regardless of `--abbrev`.
+ Non default number of digits can be specified with `--abbrev=<n>`.
-B[<n>][/<m>]::
--break-rewrites[=[<n>][/<m>]]::
diff.c
+4
-1
index f9709de7b4..20dedfe2a9 100644
--- a/diff.c
+++ b/diff.c
@@ -4319,7 +4319,10 @@ static void fill_metainfo(struct strbuf *msg,
}
if (one && two && !oideq(&one->oid, &two->oid)) {
const unsigned hexsz = the_hash_algo->hexsz;
- int abbrev = o->flags.full_index ? hexsz : DEFAULT_ABBREV;
+ int abbrev = o->abbrev ? o->abbrev : DEFAULT_ABBREV;
+
+ if (o->flags.full_index)
+ abbrev = hexsz;
if (o->flags.binary) {
mmfile_t mf;
t/t4013-diff-various.sh
+3
index b3a949ee87..dfc87a0d19 100755
--- a/t/t4013-diff-various.sh
+++ b/t/t4013-diff-various.sh
@@ -239,6 +239,9 @@ diff-tree --root -r --abbrev=4 initial
:noellipses diff-tree --root -r --abbrev=4 initial
diff-tree -p initial
diff-tree --root -p initial
+diff-tree --root -p --abbrev=10 initial
+diff-tree --root -p --full-index initial
+diff-tree --root -p --full-index --abbrev=10 initial
diff-tree --patch-with-stat initial
diff-tree --root --patch-with-stat initial
diff-tree --patch-with-raw initial
t/t4013/diff.diff-tree_--root_-p_--abbrev=10_initial
+26
new file mode 100644
index 0000000000..7518a9044e
--- /dev/null
+++ b/t/t4013/diff.diff-tree_--root_-p_--abbrev=10_initial
@@ -0,0 +1,29 @@
+$ git diff-tree --root -p --abbrev=10 initial
+444ac553ac7612cc88969031b02b3767fb8a353a
+diff --git a/dir/sub b/dir/sub
+new file mode 100644
+index 0000000000..35d242ba79
+--- /dev/null
++++ b/dir/sub
+@@ -0,0 +1,2 @@
++A
++B
+diff --git a/file0 b/file0
+new file mode 100644
+index 0000000000..01e79c32a8
+--- /dev/null
++++ b/file0
+@@ -0,0 +1,3 @@
++1
++2
++3
+diff --git a/file2 b/file2
+new file mode 100644
+index 0000000000..01e79c32a8
+--- /dev/null
++++ b/file2
+@@ -0,0 +1,3 @@
++1
++2
++3
+$
t/t4013/diff.diff-tree_--root_-p_--full-index_--abbrev=10_initial
+26
new file mode 100644
index 0000000000..69f913fbe5
--- /dev/null
+++ b/t/t4013/diff.diff-tree_--root_-p_--full-index_--abbrev=10_initial
@@ -0,0 +1,29 @@
+$ git diff-tree --root -p --full-index --abbrev=10 initial
+444ac553ac7612cc88969031b02b3767fb8a353a
+diff --git a/dir/sub b/dir/sub
+new file mode 100644
+index 0000000000000000000000000000000000000000..35d242ba79ae89ac695e26b3d4c27a8e6f028f9e
+--- /dev/null
++++ b/dir/sub
+@@ -0,0 +1,2 @@
++A
++B
+diff --git a/file0 b/file0
+new file mode 100644
+index 0000000000000000000000000000000000000000..01e79c32a8c99c557f0757da7cb6d65b3414466d
+--- /dev/null
++++ b/file0
+@@ -0,0 +1,3 @@
++1
++2
++3
+diff --git a/file2 b/file2
+new file mode 100644
+index 0000000000000000000000000000000000000000..01e79c32a8c99c557f0757da7cb6d65b3414466d
+--- /dev/null
++++ b/file2
+@@ -0,0 +1,3 @@
++1
++2
++3
+$
t/t4013/diff.diff-tree_--root_-p_--full-index_initial
+26
new file mode 100644
index 0000000000..1b0b6717fa
--- /dev/null
+++ b/t/t4013/diff.diff-tree_--root_-p_--full-index_initial
@@ -0,0 +1,29 @@
+$ git diff-tree --root -p --full-index initial
+444ac553ac7612cc88969031b02b3767fb8a353a
+diff --git a/dir/sub b/dir/sub
+new file mode 100644
+index 0000000000000000000000000000000000000000..35d242ba79ae89ac695e26b3d4c27a8e6f028f9e
+--- /dev/null
++++ b/dir/sub
+@@ -0,0 +1,2 @@
++A
++B
+diff --git a/file0 b/file0
+new file mode 100644
+index 0000000000000000000000000000000000000000..01e79c32a8c99c557f0757da7cb6d65b3414466d
+--- /dev/null
++++ b/file0
+@@ -0,0 +1,3 @@
++1
++2
++3
+diff --git a/file2 b/file2
+new file mode 100644
+index 0000000000000000000000000000000000000000..01e79c32a8c99c557f0757da7cb6d65b3414466d
+--- /dev/null
++++ b/file2
+@@ -0,0 +1,3 @@
++1
++2
++3
+$